Is there a way to transition between 2 textures?
You may want to consider MixRGB or Mix Shader node to achieve this effect. 

In the example gif I provided I plugged two different noise textures into a MixRGB node to blend between them, you could animate the 'Factor' slider using a 'value' node. You can also Change the mix dropdown to another blend type, such as add, multiply, or overlay (similar to blend types in photoshop). The resulting mix is then plugged into the Base Color for the Principled BSDF Material.

Hope this helps.